Top portion of a welding helmet



FIG. 1 is a perspective view, showing the new design for a top portionof a welding helmet;

FIG. 2 is a front view of the welding helmet of FIG. 1;

FIG. 3 is a rear view of the welding helmet of FIG. 1;

FIG. 4 is a left side view of the welding helmet of FIG. 1, the rightside view being a mirror image thereof;

FIG. 5 is a top view of the welding helmet of FIG. 1; and,

FIG. 6 is a bottom view of the welding helmet of FIG. 1.

The details shown in broken lines form no part of the claimed design.

The ornamental design for a top portion of a welding helmet, as shownand described.